what's the difference???

Let me guess.
These aren't going to be used in critical medical or military equipment, so you don't need an extended temperature range ?
And you want them to fit your breadboard ?

If so, get the CNG.
They'll operate well in your room, and they will directly fit in your breadboard.
Bonus is, they will probably the cheapest ones (maybe CWG is cheaper as they use less material).